Fuel-control mechanism for internal-combustion engines



Mar. 20; 1923.,

LMM.

H. L. TYGARD ET AL,

FILED mln/6.1920.

FUEL CONTROL MECHANISM FOR lNTERNAL COMBUSTION ENGINES.

HARRY L. TYGARD, OIF'PTTSBURGH, AND GEORGE M. HAMILTON, OF OAKWONT, PENSTSYLVANA.

FUEL-CONTROL EJECHANSE'I 1701?, INTERNAL-COMBUSTEON ENGINES.

Application filed May 6,

To @ZZ la7/.mn 7'2 may concern Be it known that we, Hanni* li. @Yoann and Grenen M. HAMYLToN. citizens oi the United States, residing at Fittsburgh and Oalimont. respectively in the county ot Allegheny and State of Pennsylvania. have invented certain new and useful Improvements in Fuel-Control Mechanism Yfor lnternal-Combustion Engines, of which the following` is a speciiication.

Our invention is an improvement in internal con'ibustion engines, and particularly in the motors ot' this type as used on automobiles or similar seit-propelled vehicles.

lt has iu view to provide. means 'tor `cutting ot? the tue] supply to the explosion chamber or chambers oi the engine at times when the car is running; upon its own momentuni` as in coasting, and tor simultaneously reducing the vacuum of the cylinders, and increasing` the compression.

Primarily, it has in view to effect a correspondinp,` economy in the use of' the explosive fuel at such times as the engine is operating' by motion transmitted to it from the connected zgearing.

Ordinarily, in such cases, the conduit between the fuel supply, as a carbureter, and the explosion chambers of the cylinder' or cylinders is normally open, so that when the engine is itself being operated by the turning over of the crank shaft and correspending actuation of the plungers, there is an undesired suction of the fuel and a wastingthereof' through ,the ordinary exhaust passages, whether the explosive mixture be ignited or not.

Our invention has in view to provide means for cutting,l off the communication between the fuel supply and the explosive chamber or chambers at such times as propeiling power of the engine is not needed., and at the same time opening communication from the cylinder or cylinders to the atmosphere, so as to ensure ample supply of air with resulting higher compression and lower vacuum in the cylinders. Uur invention contemplates the simultaneous closing` of the fuel supply, and opening` oic the circulation to the atmosphere, and vice versa.

The present invention is similar in purpose and operation to that disclosed in our prior application filed November 3, 1919, Serial No. 335,502. lt has for its object to provide a construction in which a common.

1920. temi no. 379,415.

chamber. open to the manifold, is placed in communication withthe carbureter or with the atmosphere alternately by the openingT and closing ot a pair of chamber plates coacting with communicating' passageways.

In the drawings which illustrate one vpreferred embodiment ot the invention F 1 is a vertical sectional view through a valve mechanism interposed between the tuel supply and the air supply and a manifold leading to the engine and adapted to establish circulation therewith.

Fig. 2 is a horizontal sectional view' on the line lli-ll of Fig. 1.

Fig. 3 is a vertical sectional view similar to Fig. 1 showing` the manifold communicatH ing with the atmosphere and closed to the carbureter.

Fig. l is a perspective detail view of one of the damper valves detached.

ln the drawings. in which the invention is illustrated somewhat diagrammatically, C represents the upper portion of a carbureter or other fuel supply device oit any well known construction. A manifold M, also of an ordinary type, leads to the explosion chamber or chambers of one or more cylinders communicating therewith byl the usual lateral ports. Between the carbureter and the manifold is inserted our improved controlling device which consists ot a suitable casing 2 of any convenient term having direct connection with the carbureter C by an intervening conduit 3 providing an interven ing circulation chamber 4f. Casing 3 is eon nected with easing 2 and carbureter C re spectively by suitable abutting flanges and bolts or otherwise as may be desired. The partition wall 5 oi' casing 2, between its interior 6 and chamber 4 is provided with one or more segmental shaped openings 7 and intervening closing wall portions 8, one side of which is on a continuous common plane. The opposite wall 9 of casing 2 is similarly provided with one or more segmental openings 10. and intervening solid portions 11, adapted to provide circulation between chamber 6 and the exterior of the casing for inflow ot' atmospheric air. The centra-l portion of each wall 5 and 9 respectively provides a journal bearing 11 for a cent-ral stem 12, and upon which are mounted the damper valves 13 and 14 respectively. The stem 12 may be squared as indicated at 15 or otherwise suitably shaped to 1'it the opening 16 in each damper valve, so that rotation of the stem. Will also rot-ate the valves to- Agether.v At the upper side stem l2 is provided with an operating lever 16 connected atits outerend With a terminal 17 of a pit man, crank or other suitable actuating device. Such device may be provided With any convenient operating' terminal mounted upon the dash board, steering controls o'r elsewhere, capable ot being; ea'siljy7 thrown by the operator to one side or the other ot dead center. or otherwise. whereby" to open and normally retain open or closed respec- 'tively7 valves 13 and lei and the manifold with communication to the atmosphere closed or vice versa, The valves 13 and 14 are'retained in positionon stem 12 and in sinlicientlyv tight lace engagement with the partitions and 9.J b v any suitable means as a. terminal nut 18 and a spring); Washer 19.

As thus constructed. between the carbureter and manifold` valve 14; is in closed position over the :..itniosphere parts 10 'in Fig. 1. and When the stem l2 is rotated and quarter turn ot' more or less1 parte 7 are closed cuttingrod the tuel suppljy7 and parts l0 are correspending-l57 open to the atmosphere as in Fig.

The construction and arrangement of the invention as to its particular design` proportions or other details may be variously i ,44am/4:

changed or modified by the skilled mechanic, in its applica-tion to any particular type or form of carbureter, manifoldor other oonditions incident` to the type ot engine with which itI is used. For instance the circula tion control mechanism instead of beingY separately connected with the carbureter or manifold may be made as'an' integral or incorporated member ot it and will operate in the same War as'above described. le do not therefore Wish to be limited to the exact construction shown.

l/"Vhaty We claim is:

A'valve casing` having' a middle cylindrical-chamber and a delivery opening; for direct communication With the manifold o'f an internalA combustion engine and provided.

HARRYL. TYGARD. GEORGE M. HAMILTON. 

